[meta-freescale] [meta-fsl-arm][PATCHv2] mx28-bcb: add utility to generate Boot Control Block

[Alexandre Belloni]

>From chapter 12.11.1 of the i.MX28 Applications Processor Reference
Manual, Rev. 1, 2010, a Boot Control Block is needed when booting from
an SD/MMC card. The mx28_bcb.py utility will generate and write the BCB
to a file, it will also write the provided bootstream.

Signed-off-by: Alexandre Belloni <alexandre.belloni at free-electrons.com>
---
 recipes-bsp/mx28-bcb/files/mx28_bcb.py | 56 ++++++++++++++++++++++++++++++++++
 recipes-bsp/mx28-bcb/mx28-bcb_1.0.bb   | 20 ++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100755 recipes-bsp/mx28-bcb/files/mx28_bcb.py
 create mode 100644 recipes-bsp/mx28-bcb/mx28-bcb_1.0.bb

diff --git a/recipes-bsp/mx28-bcb/files/mx28_bcb.py b/recipes-bsp/mx28-bcb/files/mx28_bcb.py
new file mode 100755
index 0000000..ea2038b
--- /dev/null
+++ b/recipes-bsp/mx28-bcb/files/mx28_bcb.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python2
+
+#import os
+import struct
+#import subprocess
+#import sys
+#import tarfile
+#import tempfile
+
+def generate_bootstream_headers(num_bootstream, start_sector):
+    return struct.pack("<I"    # Magic
+                       "4x"    # Primary Tag (unused)
+                       "4x"    # Secondary Tag (unused)
+                       "I"     # Number of Boot Stream blocks
+                       "8x"    # Padding
+                       "4x"    # Primary Tag (unused)
+                       "I"     # Base offset of the first bootstream block
+                       "4x",   # Padding
+                       0x00112233,
+                       num_bootstream,
+                       start_sector + 1)
+
+def write_bootstream_partition(device_file, start, bootstream):
+    with open(device_file, 'r+') as partition:
+        partition.seek(start*512)
+        partition.write(generate_bootstream_headers(1, start))
+
+        # Fill the rest of the first 512 bytes with 0
+        current = partition.tell()
+        partition.write(struct.pack("%dx" % (512 - current + (start*512))))
+
+        # Copy the bootstream image
+        with open(bootstream, 'r') as image:
+            partition.write(image.read())
+
+def main():
+    import argparse
+
+    parser = argparse.ArgumentParser(
+        description='Flash a SD Card at format expected by iMX28 SoCs')
+    parser.add_argument("device", help="Path to the SD Card's device file")
+    parser.add_argument("--bootstream", "-b",
+                        help="Path to the boostream image", required=True)
+    parser.add_argument("--start", "-s",
+                        help="Start of the bootlets partion (in sectors)",
+                        type=int, required=True)
+
+    args = parser.parse_args()
+
+    write_bootstream_partition(args.device, args.start, args.bootstream)
+
+
+if __name__ == "__main__":
+    main()
+
+
diff --git a/recipes-bsp/mx28-bcb/mx28-bcb_1.0.bb b/recipes-bsp/mx28-bcb/mx28-bcb_1.0.bb
new file mode 100644
index 0000000..ea9f7cd
--- /dev/null
+++ b/recipes-bsp/mx28-bcb/mx28-bcb_1.0.bb
@@ -0,0 +1,20 @@
+# Copyright (C) 2013 Free Electrons
+# Released under the GPLv2 license
+
+DESCRIPTION = "Utility to generate the Boot Control Block for freescale mx28 platforms"
+
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/GPL-2.0;md5=801f80980d171dd6425610833a22dbe6"
+
+SECTION = "bootloader"
+PR = "r1"
+BBCLASSEXTEND = "native nativesdk"
+
+SRC_URI = "file://mx28_bcb.py"
+
+S = "${WORKDIR}"
+
+do_install() {
+    install -d ${D}${bindir}
+    install ${WORKDIR}/mx28_bcb.py ${D}${bindir}
+}
-- 
1.8.1.2